Nature The story of Africa's biggest animal migration is told through the eyes of a single zebra family: a stallion, his three mares and their offspring, in this new episode. 8 p.m. KOCE

Supernatural Sam and Dean (Jared Padalecki, Jensen Ackles) are cornered, with Crowley (Mark Sheppard) threatening to undo all they've accomplished as hunters, but they might have one last chance to take down the Demon King with a little help from Kevin (Osric Chau). Misha Collins, Curtis Armstrong and Amanda Tapping also star in the season finale. 9 p.m. KTLA

MythBusters Do hand dryers work better than paper towels? And where's the best place to stand during an earthquake? 9 p.m. Discovery

CSI: Crime Scene Investigation A reporter (James Callis) follows Russell (Ted Danson) and the team as they probe a series of murders. Annabella Sciorra and Eric Roberts also guest star and the band Black Sabbath performs in the season finale. 10 p.m. CBS

Nashville Lamar (Powers Boothe) sides with Rayna (Connie Britton) in her dispute with Teddy (Eric Close) while Jolene (Sylvia Jeffries) tries to help Juliette (Hayden Panettiere) in this new episode. 10 p.m. ABC